Why the STM:
- has counters with double glazing (like 1cm each) and you can't hear anything from the staff
- has no speaker and microphone (like most of the subways in other countries) so that staff and clients can communicate
Infrastructure in China has developed in a flash.
You can now take a cheap and fast train transit from Hong Kong to China.
Even HKese prefer to spend their money "up North" as it cheaper, convenient transportation and high level of service.